What happens instead?
I get an error described below; however my mount/pet is also there, so it's just a little annoying.

What version of the product are you using? Don't use any version information you get from the files, I have not changed any of those in a long time. The breakdown of my versioning style:
- v + 12 Digits:
- - vYYYYMMDDHHMM (in Mountain Standard Time)
- v + *.*.*:
- - vMajor.Minor.Alpha (old style)